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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 31 |
| 3 | 294 |
| 4 | 2727 |
| 5 | 25048 |
| 6 | 228826 |
| 7 | 2083371 |
| 8 | 18925047 |
| 9 | 171633840 |
| 10 | 1554702516 |
| 11 | 14069962041 |
| 12 | 127240600050 |
| 13 | 1150026301089 |
| 14 | 10389276050527 |
| 15 | 93819553163854 |
| 16 | 846952848390039 |
| 17 | 7643713441711560 |
| 18 | 68967751709641564 |
| 19 | 622154460094492809 |
[3,31,294,2727,25048,228826,2083371,18925047, 171633840,1554702516,14069962041,127240600050, 1150026301089,10389276050527,93819553163854, 846952848390039,7643713441711560, 68967751709641564,622154460094492809] |